estimated, 40. at the subconscious neuron firing per second, 40 million. larry: is the heart, cara, in conflict with the brain? i know this girl is wrong for me. that s a different thing. i think this is actually really important, because it speaks to what some of the panelists have been saying about the prefrontal cortex and its connections to some deeper brain structure, such as the limb bik system thought of to be responsible for emotion. even in a healthy brain, we have neuron tracts. we have fibers that connect neurons in certain areas of the brain to neurons in other parts of the brain. there are many tracts connecting to the prefrontal cortex. but there are almost none connecting back to the limpic system. it has total control over our executive function. our sort of conscious being